Pascal Kobeh / Necklace starfish (Fromia monilis) on variable thorny oyster (Spondylus varius), Maldives, Indian Ocean. This starfish is a predator of oysters.
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Georgette Douwma / Thorny oyster (Spondylus varius), patterns and colours on mantle caused by Zooxanthellae. Derawan Islands, East Kalimantan, Indonesia.